Decree of Dionysopolis

The Decree of Dionysopolis was written around 48 BC by the citizens of Dionysopolis (today's Balchik, on the Black Sea coast of Bulgaria) to Akornion, who traveled far away in a diplomatic mission to meet somebody's farther in Argedauon. The decree, a fragmentary marble inscription, is located in the National Historical Museum in Sofia.

The decree mentions a Dacian town named Argedauon (Ancient Greek: Αργεδαυον), potentially Argidava or Argedava.

The stone is damaged and name was read differently by various editors and scholars:

The inscription also refers to the Dacian king Burebista, and one interpretation is that Akornion was his chief adviser (Ancient Greek: πρῶτοσφίλος, literally "first friend") in Dionysopolis. Other sources indicate that Akornion was sent as an ambassador of Burebista to Pompey, to discuss an alliance against Julius Caesar.

This leads to the assumption that the mentioned Argedava was Burebista's capital of the Dacian kingdom. This source unfortunately doesn't mention the location of Argedava and historians opinions are split in two groups.

One school of thought, led by historians Constantin Daicoviciu and Hadrian Daicoviciu, assume the inscription talks about Argidava and place the potential capital of Burebista at Vărădia, Caraş-Severin County, Romania. The forms Argidava and Arcidava found in other ancient sources like Ptolemy's Geographia (c. 150 AD) and Tabula Peutingeriana (2nd century AD), clearly place a Dacian town with those names at this geographical location. The site is also close to Sarmizegetusa, a later Dacian capital.

...
Wikipedia